Teledyne LeCroy AORM - Advanced Optical Recording Measurements - Manual (Page 9)

AORM Software Package
923133 Rev A ISSUED: June 2013
7
WHAT CAN AORM DO?
The Advanced Optical Recording Measurement (AORM) package for Teledyne LeCroy digital
oscilloscopes provides a set of waveform measurements and mathematical functions for the
analysis of optical recording signals. Parameter measurements allow the categorizing and listing
of measurement values in a variety of ways. The math functions (Histogramming and Trending)
enable information to be revealed graphically.
The Advanced Optical Recording Measurement package provides parameter measurements for
evaluating jitter due to intersymbol interface and emulation of DVD’s equalizer, slicer, and PLL.
This functionality helps you to perform clock and jitter measurements, independent of a specific
Integrated Circuit, allowing you to concentrate on optical head or media performance only. To
support advanced optical recording drives that have constant angular velocity (CAV) or zone
constant linear velocity (ZCLV), parameter measurements support automatic determination of the
clock period.
Histogramming
Histograms can be created for any waveform parameter. They are displayed based on a set of
user settings such as bin width or number of parameter events to be used. Histogram parameters
are provided for measuring different histogram features such as standard deviation, number of
peaks, and most populated bin. Histograms are selected by defining a trace as a math function,
and selecting Histogram as the math function. As with other Zoom traces, histograms can be
positioned and expanded by using the front panel POSITION and ZOOM knobs.
Trending
The Trend function allows you to create a graph containing successive waveform parameter
measurement values. The trend function provides useful visual information on the variation of a
waveform parameter within a sector, or even over multiple sectors. The Trend functionality,
coupled with other scope features, enables you to graph certain parameters against one another.
Model of Optical Recording Processing
In many applications, it is important to make timing and jitter measurements directly from the RF
signal, independent of a specific DVD chip. The optical recording processing function in AORM
can perform this processing and can let you view the equalized data, sliced data, threshold,
and/or the recovered clock. You can control the cutoff frequency and boost of the equalizing filter,
the closed loop bandwidth of the 1
st order integrating slicer, and the bandwidth of the phase-
locked loop (PLL).
Selecting Parameters
1. Select Measure from the menu bar,
2. Touch the Px tab for the desired parameter position (P1 to P8).
3. Touch inside the Measure field, then select the Optical Recording group of parameters: